/**
 * `:::columns` in the running text (#634). A group outside a box sets its
 * blocks in N sub-columns of the text column (`span="column"`, the
 * default) or across the page (`span="page"`, a band of a multi-column
 * page, cut as a page-span box cuts it). The build wraps each such group
 * in a frameless box (a synthetic `:::callout` with one of the
 * {@link FLOW_COLUMNS_STYLE_ID} styles), so the callout machinery places
 * it, cuts it between its sub-columns when it does not fit (the group's
 * `flow`, see `columnsGroup.ts`) and, across the page, cuts the band. The
 * box has no frame, padding, title or icon; it never stays whole, and its
 * children are set in the text's own typography (`isFlowColumnsStyle`:
 * the box lends them no body or list style).
 */
import type { ContentBlock } from '../parse/index.js';
import type { CalloutStyleConfig, Dimension } from '../types.js';
/** Style ids of the frameless boxes of main-flow groups, in the text
 *  column and across the page. Not user styles: no configuration can
 *  name them. */
export declare const FLOW_COLUMNS_STYLE_ID = "__postext-flow-columns";
export declare const FLOW_COLUMNS_PAGE_STYLE_ID = "__postext-flow-columns-page";
/** Whether a callout style is a main-flow group's box. */
export declare function isFlowColumnsStyle(id: string): boolean;
/** The two boxes: in the column, the sub-columns `columnGapPx` apart (a
 *  body line by default); across the page, `pageGapPx` (the gutter). The
 *  space below is the body's paragraph spacing, unless the group's fence
 *  sets its own (`marginTop`, `marginBottom`, #714); a cut between children
 *  keeps `splitMinLines` lines of text on each side (the body's orphan and
 *  widow minimums). */
export declare function flowColumnsStyles(columnGapPx: number, pageGapPx: number, marginBottom: Dimension, splitMinLines: number): CalloutStyleConfig[];
/**
 * `blocks` with every `:::columns` group outside a box wrapped in a
 * synthetic frameless box (see the module comment): a group with
 * `span="page"` in the page-wide one, any other in the column one. A
 * group inside a box keeps to it. `wrapped` tells whether any was: the
 * build then adds the boxes' styles to the callout styles. The same
 * blocks come back when none is wrapped.
 */
export declare function wrapFlowColumns(blocks: readonly ContentBlock[]): {
    blocks: ContentBlock[];
    wrapped: boolean;
};
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